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H. H. IDE. AUTOMATIC TELEPHONE SYSTEM.

2 SHEETSSHEET I.

Patented Aug. 15, 1916 APPLICATION FILED JUNE I9, I914.

AUTOMATIC TELEPHONE SYSTEM APPLlCATlON FILED 1UNE19. 1914. P 1.,194,741. Patented Aug. 10, 1916.

2 SHEETS-SHEET 2.

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HEFFQ HJdEQ w wgg g HARRY 1-3; FEE, OF GHIGAGO, ILLINOIS, ASfiIGNUR- T0 KELLOGG- WWITGI SUEPFLZ CQMIAINY Oh CHIQIAG-C), ILLINGZS, Es CORYOBATIGBI (E3? 111L111 WIS.

AUTOMATICG TELEPHQHE. SYSTEM.

Specification of Letters Patent. Patentefi A g, 15 this npplication filed June 19, 1914. serial No. $46,018.

2' '0 all to ham may concern: Be it hnownthat I, la RY 1-1. ion, a citizcn of the United States of America, resid in. at Chica o in the count of Cools and 1 this character in which the control of the various operations incident to the completion or" call are controlled principally by dis"- t'erential' relays. i

My invention further contemplates to so arrange the relays and other local apparatus at the exchange as to provide a clear talking circuit My invention also has for its object the provision. of it two wire circuit simplified in a number of operating and control mechanisins required to complete the various functions required to be performed incident to the operative actuation of the various clevices.

An important feature of my invention concerns itself also primarily with prevent ing the called subscriber from holding up the entire connection in case the calling subscriber hangs up but the called subscriber does not. o

I will explain a system embodying my invention more in detail by referring to the accompanying drawings illustrating the some in which- Figure 1 l and Fig, Port ll represent diagrammatically a system includ ing a line switch, firstselector; and connector arranged in accordance with my invention together with their association with subscribers lines no complete a call; Fig. 2

is a dicgronnnatic view showing the meclnuiical zn-rnngeincnt of the line switch; and Fig. 3 is a semidiagrammatic view showing the ll'lfiCillli'llCltl arrangement of the selecto and counecton y In order to facilitate a proper understanding of the drawing; it is pointed out that Fig. 1 Part II is adapted. to be a continua tion to the right of the circuit shown in Fig. 1 Part l, it'may also be pointed outthat features of the line switch and selector niore clearly set forth in application oi. llillnni Kaisling, Serial No. 600,664.,

cated by the clotted linelQ filed Jan. 3, 1911, and the application of Charles S. Winston Serial No 'Zllfififi, filed Feb. 19, 1913.

l have shown the subscriberb substation at A; as including the usual talking equipment of a common battery telephone with the addition of a calling switch 1 adapted to break the continuity of the circuit preferably of the line concluctorlfl, and asecond line conductor 8 completing; the extension of the subscribers equipment to the control exchange where it terminates in a line switch B. The circuit for the subscribers station A will be carried through a series of continuations to finally establish a connection with the subscribers telephone 0 which is also showncs having a line switch D similarto the line switch B. llhe line switch B, for instance, is provided -Lwith wipers 4, 5 and. 6 diagrammatically inllicatcd by the wiper 4 in Fig. 2, which wipers are controlled by the motor magnet MM, the line relay Lit-and the cut oil relay G0. The line relay and out 05 relayboth control holdingpawls for the step-up element which actuates the wipers and the motor magnet controls the step-up pawl to move said wipers. An ofi normal switching device @N is provided which is actuated with each first step of the wipers. The selector and connector switches in mechanical arrangement are like the structure of Fig. 3 where the wipers 7, 8 and 9,,diagrammatically indicated at 7 in Fig. 3, are controlled by a rotatable spindle l0 rotated by the primary .magnet PM and also controlled in a vertical.

movement by the secondary magnet SM. which controls the driving bar 11. 'lhe wipers 7, 8 and 9 are adapted to engage suc- 2 contacts arranged in what might be calledvertical and horizontal rows as more clearly seen from Fig. 3, the com plete movement of the wipers being indiwhen traveling from the zero position sown in Fig. 3 hack to this zero position otter having completed a contact. Each set or" contacts is three in number to correspond respectively to the wipers 'Z, 8 and t as will be readily apparent. The selector switch also controls a plurality of sets of ofi normal contacts, the primary ofi normal contacts'PONenol the secondary ofi-normal contacts SON, each of which is actuated with the first movement respectively in a rotary a'fid in s ve ical direction. lVhen I say vertical direction, I

wish it understood of course that the upward movement of the wipers is not in a straight. line, but is along the arc of a circle as these wipers are pivoted.

Assuming now for mstance that a call is to be traced from the substation A. to the factuates the wipers 4, 5 and 6 to select a nonbusy first selector. The very first movement ofthe Wipers of course transfers the "off normal contact to its alternative position. The transference of this 011' normal contact opensthe circuit through the cutoff relay, but this cut-oil: relay is maintained energized so long as the wiper 4 finds a grounded contact, thereby keeping the circuit through the motor magnet MM closed. Whennn idle selector is reached, the cut-E relay CO is de'e'nergized and opens the circuit of the motor magnet. The line relay LR is slbw acting and holds momentarily even though the cutofi relay releases until this line relay I again finds its circuit closed as will now appear. As soonas the wipers 5 and 6 reach the terminals of the line conductors 1 1 and of the first selector, impulse relay IR is energized as is readily apparent by being connected to both of these conductors 1 1 and 15, the circuit through which conductors are closed byway of the subscribers station'A.

\ switch 1 a given number of impulses come.

The impulse relay IR thus attr'acts its armature's, thereby" placing a ground from 16 through its armature 17, upon. the contact 19=leading to the release relay RB which is thereupon energized and locks itself in position through its own grounded armature 18. At the same time secondary release relay SR receives current through both of its windings-as will be clear, but being differentially wound, does not actuate its armature. Similarly a circuit may be traced from ground 'at-20through the armature of the release relay. RR, the normal contact of the primary off-normal switch PON, the private conductor 21, through the wiper 4;, through the line relay LR, through battery to' .ground, thus keeping this line relay energized. The subscriber then actuates the spending to one of the digits of the number called for, whereupon the impulse relay. IR

has its circuitbroken and made a number of times corresponding to the digit. The release of -the armature 22 periodically grounds the primary magnet PM at 18, relay RR remaining energized, to thereby step the wipers 7, 8 and 9 to the proper vertical bank corresponding to the desired sec-' ond selector or connector. During this interval the secondary release rel'ay SR has had the circuit through one of its windings periodically madeand broken at the armature 22, thereby destroying the balance of the two windings and causing this relay SR to attract its armature 23 and to keep it attracted as the time between impulses is not sufficient to again restore the Balance sufficiently to allow this armature to retract. For the same reason relay RR remains energized. Upon completion of the impulses the relay IR of course remains again energized, whereupon the balance is restored as far as the relay SR is concerned to again permit retraction of the armature 23, thereupon closing a circuit from theground of the primary off normal switch PON (which is now in its alternative position) through the normal contact of the secondary elf-normal switch SON, through the test relay T, through battery to ground. A circuit is thereupon established through the secondary magnet SM and its associated source of alternating or intermittent current to ground at 16, whereupon the wipers 7, 8 and 9 are carried in a vertically disposed arc over a series of contacts leading to a particular set of connector switches, which movement continues so long as the wiper 7 finds a grounded contact 2i, but which ceases when this wiper has found an ungrounded con tact such as the one associated with the private conductor 25. Of course the first movement toward the selection of an idle connector in the desired group causes a movement of the secondary off normal switch SON to its alternative position, thereby breaking the originally established circuit through the test relay T. However the relay T is maintained inan energized condition so long as the wiper 7 finds a grounded contact 24: as -a circuit can be traced from the ground at,26 through the test relay T, the armature 27 of the relay.

RR, the front contact of the armature 28 of the relay T, armature 28, wiper 7 to the grounded contact 24. Assoon as the wiper 7 reaches an ungrounded contact relay '1 is deenergized, thereby deenergizing the secondary magnet SM to prevent further movement of thewipers 7, Sand 9. The

wipers 8 and 9 are now assumed'to bein assbciation with the line wires 29 and 30 of either a second selector or connector, a connector being herein shown and at the same time the wiper '7 is associated with the conductor 25, which conductor 25 immediately becomes grounded at the connector aswill 26 line switc:

held i connector operation.

mower fill connector.

"iihe energization of the magnet Milli. disconnects the impulse relay 1R from the talk ctr-ends and 15, whereupon a balance lished through the windings of the so that this relay releases, wherereiey SB also releases, the relay '1 already been released as stated. The energisation of the relay MRR also opens the release circuit at the armature 31. The calling line is thus held up. y or the line switch has its circt c through the ground of the prime y ul switch PON, of the l do llIS'i? selector would be the oil normal switch oi lii'st I. the sedonil' selector if such were used, otter the second selector had made its operations, tho-relay Edit-liter the first selectorprior to the moveincntpof the primary oil normal so .switch FUN of the second selector having itscircuit closed through the agency of the release relay of the second selector. All this it .is thought will be readily clear and it will be only necessary for me to describe the The subscribers circuit is thus. completed through to the talking conductors 29 and 30 of the connector E which forms Part ll of Fig. 1. The subscribers circuit being closed, the completo tion of the circuit to these conductors 29 and 30 causes the operation of the relay IR.

The operation of this relay grounds the privote conductor 25 by way of the armature 52, thus establishing the circuit before mentioned through the relay MRR of the first selector or a similar relay ii a second selector happens to be interposed. The operation of the reley IR also closes a circuit from the ground through the armature 32,

5o conductor. 33, back contact of the primary oil normal switch. PON, through a winding of the relay RR, through battery to ground. This relay is thereby energized and locks itself through its left hand winding, the

5:5 right hand winding being open at the armature 32. The operation of the relay RR connects ground by way ofthe armature 34 to c. terminal of the lower winding of the relsy B1. A connectionis also established cc between the right hand winding of the relay by way of the armature armature 36, the open back contact of the armature 32 f the relay IR. The operation of the reley RR also at the armature 37 opens the es circuit from the secondary magnet SM to windings of this relay M being closed at the armature 3t and the other at the armature 38. The subscriber now sends the impulses -which are to cause the primary movement of the connector. The impulse reluy 1B. operates at each impulse, the first impulse moving the primary ofi normal switch PON to its alternative position, whereby a common ground is provided for the connector through the switch arm 39 and also the switch arm Q0.

The first impulse opens the circuit through the left hand winding of the relay M at the armature 41, thereby actuating this relay M. The relay M thereupon. attrncts all of its crmatures and being differentially wound remains actuated throughout these .in'mry impulses, but releases its armatu after cessation of the impulses. Similarly the cctuations of the armature breaking; the circuit through the right hand winding of the relay RR do not cause debnergitaa tion of this relay. T he intermittent operation oi" the armature 4E1 establishes a circuit from ground at 42 through switch Contact 40, conductor 33, armature 41, armature l3 of relay li-Lby way of arnmture lat through the primary magnet PM to ground. The requisite number of impulses being sent, the connector is stopped around to the right bank, ready for the movement of its wipers in a vertical plane due to the final series of impulses to be presently received from the subscribers instrument. After the lust impulse just described by which the primary magnet PM is operated, the relay llt remains energized as before. 'lil agnet M being' diflerentially wound again releases its :irmatures thereby opening; the circuit at the armature 43 and closing the circuit at the armature l5, thereby establishing a circuit through. the relay SW which may be traced from ground through battery, through said relay, through contact spring 46, conductor 47*, contacts of the secoiidary oil normal switching mechanism SON by way of armature 45 to ground through the switch contact 5590f the primary oli' normal switching mechanism PON'. Relay SW is thus energized and locks itself by way of the armature 4:7 to ground tln'migh the switch arm 39. By the operation of this relay SVV the circuit through the primary magnet PM is broken at the immature 4A and es- A;

lie

responds as before and the relay M is actuated the sameas before. The secondary magnet SM thus has its circuit completed through the armatures 44, 43 and 41 to the ground at 42, whereby the wipers are ad vanced the correct number of steps to engage the wipers 49 and 50 with the line wires 51 and 52 of the desired line. .The

, first step of course moves the secondary off normal switching device SON to its alternative position. After the last impulse, relay M is again denergized. Relay SW is thereupon energized, circuit for which extends from the ground by way of armature at the armature 48 of the relay SW. The

circuit to the called substation O is thus completed and the only relays which bridge the talking circuit are the relays SR and IR.

It will be noted that the relay IR supplies the talking current to the calling station and the relay SR supplies the current to the called station. Now if the subscriber called for is busy, then the wiper 47 will find a ground on the multiple contact of this line whereby relay SW will be held up to control the connection of the busy buzz BBon the line of the calling subscriber.

The calling subscriber thereupon'hangs up. l/Vhereupon the relay IR is deiinergized to ground the back contact of the armature 32, thereby establishing a circuit from this ground by way of armature 36 of the relay SR through the right hand winding of the relay RR. whereby this relay releases to close the circuit of the interrupter INT by way of the primary off normal switch PON through the secondary magnet SM" whereby the connector completes the movement of its wipers in a vertical plane whereupon said connector rotates and then drops back to its normal position, thus, operating the primary off normal contacts PONS and secondary 01f normal contacts SON to with draw the ground c'onnection. Thereupon I the. first selector releases as it is held up merely by the ground connection of the connector and this releasing operation continues in the reverse order of the setting up operation. If the called for party is not busy, then the wiper 47 does not find a ground, whereupon the relayzSW fls deenergized closing the circuit of the private wiper 47 by way of armature 48 by way of the relay RI to ground at the armature 34.

Relay RI thereupon operates as the wiper 47" has found battery through the cut-olfrelay CO, whereby this relay RI short cir-' cuits its previously energized winding and establishes a circuit through its other wind ing, also grounding the private wiper 47 by way of the armature 34. The relay RI thereby connects the ringing generator G to the contacts of the relay CD .and connects the interrupter INT through the winding of said relay OD. The relay CD thereupon intermittently causes a ringing current to be. transmitted to the substation C.

through the grounded armature 55.

If: the party at the substation C answers relay SR is actuated to actuate the relay reversing relay RV thus reverses the con- 1 nection of the relay IR with the lines of the callingsubscriber as well understood, and through the agency of the armature 54 also operates the relayMRR to disconnect the generator G and the interrupter INT. Relay MRR locks itself through the ground by way of the armature 54 so that if the called subscriber vibrates his switchhook, relay RV is actuated, which reverses the battery on the line for toll supervision as well understood. ,When both subscribers hang up the release operation is the same as when the calling subscriber .hangs up if 1111 able to raise the called subscriber.

Animportant feature of my invention concerns itself also primarily with preventing the called subscriber from holding up scribe'r hangs up, but the called subscriber does not. Assuming that the calling subscriber hangs up, relay IR releases to break the circuit of. the relay M at the armature 41. This circuit however is made again at the armature 32 byway of the closed contact on the relay SR at the armature 36 so that relay'M pulls. up and immediately restones, but during this interval between the operation of the two armaturestl and 32 has opened the circuit of the wire 25 leading to the second selector or first selector as the case may be, thereby releasing this first selector. When the armatures of the relay M restore however the busy test is again placed upon the Wire 25 by way of the armature. 56 of said relay M. Every. thing thus releases but the connector. If the calledpar ty then hangs up, relay SR is oleiinergized, whereupon the right hand winding of the relay RR receives its quota of current by way of the armatures 35, 36

and 32, thus releasing said re ay RR and causing a release of the connector.

From what has been described the nature of my invention will be clear as will also its application to thisas well as other systems.

Having however thus described one form which my invention'inay take, what I claim the entire connection in case the. calling suba calling subscribers line to set said switches to complete a connection to a called line, and means controlled at the calling station operable after response of a called connected station to release the connection of said calling station from said called station independently of said connected called station, said last aforesaid means including a circuit controlling element adapted tov be rapidly moved from one position to its alternative position and back again to thereby momentarily release the holding circuit for the other switches, of the series. 4

I 2. In an automatic telephone exchange system the combination with a plurality of switches adapted to be set up in a series to establish a connection], means controlled. by a calling subscribers line to set said switches to complete a connection to a called line, and means controlled at the calling station operable after response of a called connected station to release the connection of said calling station from, said called station independently of said connected called station, said last aforesaid means including a circuit controlling element'adapted to be rapidly moved from one position to its alternative position and back again to thereby momentarily release the holding circuit for the other switches of the series, and by its second movement to restore the ground connection to the terminal of said holding circuit.

3. In an automatic telephone exchange 4 therewith, means for rapidl system the combination with a plurality of switches adapted to be set up in a series to establish a connection, means controlled by a calling subscrihers line to set said switches to complete a connection to a called line, and. means controlled at'the calling station oper able after response of a called connected station to release the connection of said calling station from said called station independently of said connected called station, said last aforesaid means including a circuit controlling element adapted to be rapidly moved from one position to its alternative position and back again to thereby momentarily release the holding circuit for the other switches of the series, and by its second movement to restore the ground connece tion to the terminal of said holding circuit, and a relay for operating said-- circuit controlling element;

l. In an automatic telephone exchange system the combination with a plurality'of switches adapted to he set up 111 a series to establish a connection, means controlled by a calling subscribers line to set said switches to complete a connection to a called line, and

means controlled at the calling station open able after response of a called connected sta tion to release the connection of: said calling station from said called station independ' ently or" said connected called station, said last aforesaid means including a circuit controlling element adapted to be rapidly moved from one position to its alternative position and back again to thereby momentarily release the holding circuit for the at; other switches of the series, and by its second movement to restore the ground connec tion to the terminal of said holding ci fcuit,

a relay for operating said circuit controlling element, and a second relay controlled diso rectly by the called line having means to effect the rapid dual action of said first aforesaid rela 5. Ainetallic line control circuit for automatic switches comprising an impulse relay, as a two conductor ating circuit for sai relay having a transmitter co y operat impulse relay responsive to mitter for transmit ,ing prir difi'erential release relay hav operating winding responsive energization of the impu I its armature, means for holof ture attracted during the tions of the impulse relay, a winding for said release relay e cause a retraction of its ar sponsive to an extended dc the impulse relay, and'a re 1y to co connection of said impulse relay with control circuit.

6. A metallic line control circuit for dimension automatic switches incluoi impulse relay, a two conductor opera cuit for said relay having a call t .a. connected therewith, means crating the impulse relay call transmitter for impulses, a differentials erated over one of its winding armature responsive to the operation of the impulse relay, neu ing Winding for said secondary relay tive upon cessation oi the primary operations of the impulse relay to cause a secomlary circuit change following the primary impulses, and a circuit and connections for said secondary differential relay independent of said two conductor operating circuit.

7. A telephone system including a telephone line, a two-dimer n automatic switch for extending mime on from said telephone line, an impulse relay for said switch responsive to circuit changes in aid 1L5 telephone line, a diiierential secondary lay responsive to said impulse relay for con trolling a secondary circuit, a switching re" lay for disconnecting said impulse relay from the said telephone line, and means controlled by said switching relay for releasing the said automatic switch. r

8. 1 a telephonesystem a subscribers ,.line, an automatic switch for extending a connection from said line having a primary motion to select groups of lines and a secondary motion to select an idle line "in a group, an impulse relayfor controlling said.

primary motion, a differential secondary reto be connected to said hire, an impulse relay for said switch responsive to circuit changes in said subscribers line, a difleren tial relay for said switch "for eifecting a secondary circuit change, a third relay for disconnecting said impulse relay from said subscribers ne, 'anda release circuit for said switch adapted to be eil'ected when said last relay is deenergized, 10. In a telephone system a subscribers line, an automatic switch adapted to be connected to said line, an impulse relay for said switch responsive to circuit changes in said D subscribers line, a differential secondary relay controllable by said impulse relay for eflecting a secondary circuit change, a switching relay for disconnecting said impulse relay from said subscribers line after said secondary relay has been operated, and means for subsequently operating said last relay to bring about a release of said switch.

11. A telephone system including a sub-' scribers .line, an automatic switch adapted to be connected to said subscribersline, an

impulserel'ay for said switch responsive to circuit changes in said telephone line, a differentially .wound release relay responsive toja' prolonged deenergizatlon of said 1mpulse relay, and a switching relay for disconnecting said impulse relay from said subscribers line and for rendering incited tive the operations of said release relay. 12. Altelephone system including a subscriberstelephone line, an automatic switch adapted to be connected to said telephone line, an impulse relay responsive to circuit changes in the said telephone line, a release relay for controlling a release c1rcu1t,-sa1d release relay being responsive to a prolonged denergization of said impulse relay/ and a switching relay for disconnecting said 1mpulse relay whereby said impulsez relay is des, energized and said release relayrendered to ineffective to relase said automatic switch."

13. A telephone system-comprising a sub scribers telephone line, an automatic switch .for extending a connection from said line having one motion-for electlng groups of trunk lines and a second. motion for-selecting an idle trunk in the elected groupcf trunk lines, an impulse relay for controlling: said first motion, a difi'erential secondary relay .for controlling the said second motion, and

a third relay for disconnecting said impulse relay after said switch hasbeenoperatedto select an idle trunk.

14. A' telephone system comprising a sub scribers line, an automatic switch for extending a connection therefrom,- an impulse relay for said-switch adapted to be bridged across the subscribersiine circuit, means foroperating said-impulse relay fortransmitting primary impulses,a d fferentialseoondary relay, means forqoperating said "sec-v ondary relay upon thecessationyjof said pri? mary impulses to efiect a secondary/circuit change, a switching relay adapted to 'subse quently disconnect said impulse relay from said subscribers line, and means forreturn mg Sa1d"SW1tCl1 l)O normal.

15. An automatic switch of the character described for extending connections, an impulse relay for said switch controllable over 9r the two sides of a calling subscribers line in series, a differential secondary relay responsive to an operation of said impulse relay to efl'ec't a secondary [circuit change; a differentially wound release relay. respon-fi sive to a prolonged deenergization oflsaid impulse relay, and a switching relay for disconnecting saidimpulse relay from the subscribers line thereby removing. the subscribers control of said impulse relay and 00 .said. differential relays.

16. A line control circuit for an automatlc switch comprising an impulse relay,

means for operating said. impulse relay to transmit impulses, differentially wound sec-'10s ondary and release relays for said switch, and a switching relay fpr d sconnecting said impulse relay control cn'cuit.

. Signed by me at Chicago, county of Cools and State of Illinois, in the presenceof two 119 witnesses.

HARRY H. IDE. Witnesses GEORGE MUELLER, M. R. Roonrom). 

